Linear Bearing Specifications- Needle Roller Bearings

- Jan 21, 2019 -

Linear bearing specifications

Linear bearings are linear motion systems that are produced at low cost and are used with infinite strokes in conjunction with cylindrical shafts. Since the carrier ball is in point contact with the shaft, the load used is small. The steel ball rotates with a very small frictional resistance, so that smooth motion with high precision can be obtained. Linear bearings are widely used in precision equipment such as electronic equipment, tensile testing machines and digital three-dimensional coordinate measuring equipment, as well as sliding of industrial machinery such as multi-axis machine tools, punching machines, tool grinding machines, automatic gas cutting machines, printers, card sorting machines, food packaging machines, etc. component.

Linear bearing specifications

Needle roller bearings

Lubrication and friction

A. Oil lubrication

If lubricating with oil, it is not necessary to remove the anti-corrosion oil. According to the temperature change, the lubricating oil of ISO viscosity grade VG15-100 can be used. The shaft lubrication can be given from the oil supply pipe or from the oil hole on the outer bearing seat. Since the seal will scrape off the oil, oil lubrication is not suitable for non-porous bearings with seals. B. Friction coefficient

For linear bearings, the coefficient of motion friction ranges from 0.001 to 0.004. The energy loss due to friction is small. When the moving speed is less than 60m/min, the temperature effect is negligible. The frictional force can be derived from the following equation: F = ц.. P+fs

F: friction force (N) *: sealing resistance (2 to 5N)

P: external load (N) ц: friction coefficient

C. Grease lubrication

Straight-line bearing, the inside is injected with anti-corrosion oil. If it is lubricated with grease, first remove the anti-corrosion oil with kerosene or organic solvent, and add grease after air drying. It is recommended to use lithium soap grease with a tack of N0.2.

Needle roller bearings

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